Effects of Maize and Peanut Intercropping on Yield and Water Use Efficiency under Different Precipitation Years in Semi-arid Region of Western Liaoning
Aiming at the problems of insufficient rainfall and unequal distribution of water resources in the semi-arid region of western Liaoning,a more resilient planting model adapted to climate change was selected.This study conducted field experiments and compared with maize(MS)and peanut(PS)as the control,the effects of intercropping patterns of maize peanut 2 rows/2 rows(M2P2),maize peanut 4 rows/4 rows(M4P4)and maize peanut 8 rows/8 rows(M8P8)on yield and water use efficiency in different precipitation years were studied.The three-year M2P2,M4P4 and M8P8 treatment LER were 1.02‒1.08,1.10‒1.15 and 1.07‒1.08,respectively.Research has shown that intercropping of maize and peanut has increased the productivity in different precipitation years(LER>1).As the intercropping stripes turned widened,the intercropping advantages of maize and the intercropping disadvantages of peanut were both weakened.Maize had edge row advantages in the intercropping system,while peanuts had edge row disadvantages.In the same intercropping treatment,the maize yield per plant in edge row was significantly higher than that in other rows and sole-cropped maize,while the peanut yield per plant in edge row was significantly lower than that in other rows and sole-cropped peanut.Increasing the edge row advantage of maize and reducing the edge row disadvantage of peanut are important ways to achieve high yield and efficiency in maize and peanut intercropping system.Maize was the main factor for stable production in the intercropping of maize and peanut,and there was no significant difference in maize yield and harvest index in different precipitation year types.As the intercropping stripes turned narrower,the harvest index,number of ears per unit area,number of grains per ear,and hundred grain weight of intercropped maize showed an increasing trend,while these were the opposite in intercropping peanut.There were significant differences in the number of ears and grains per unit area of maize and the number of pods and grains per unit area of peanut in different precipitation years,while there was no significant difference in the hundred grain weight of maize and peanut.The LER and WER of M4P4 were the highest(1.09‒1.15)among different precipitation year types.Intercropping pattern suitable for semi-arid area of Western Liaoning.
corn peanut intercroppingdrought resistant and stable productionwater use efficiencydifferent precipitation typessemi-arid region of Western Liaoning
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